Re: #4 Injector line on Perkins

I think you are onto something...I just decided has to be the cam...we replaced all springs, retainers, seats & guides but never actually had the cam out. We looked at it from the bottom but never had it out or measured lift. I have tried everything from way to advanced to way too retarded, swapped injectors, swapped check valves, nothing takes knock away at high rpms, & its always on # 2...looks lake its back to pulling at least valve cover & trying to measure lift / duration...

Re: #4 Injector line on Perkins in reply to LStangle, 05-24-2014 14:56:58

Well I haven't had much time to work on it lately...my neighbor has a compression tester I can use so that's my next step...but after talking to some other people seems as though bad cam or rod is very unlikely...I think there has to be something wrong with the delivery side of the injector pump. There has to be something restricting or overfueling the #2 cylinder. I know everyone will say this isn't possible but there aren't many options left. I have a local rebuilder that I'm thinking of sending the pump to so he can run it on his test stand and hopefully figure it out. I'll post the results of my compression test and valve clearances...

Re: #4 Injector line on Perkins in reply to LStangle, 05-24-2014 18:33:40

Sounds like you have an intake lobe issue with the cam not allowing enough air into the cylinder. Raw fuel will eventually build up in the cylinder and burn when it can causing your knocking. Another thought, is something in the intake manifold port blocking the passage? I forget the head port design. White fuel smoke is lack of compression/air causing delayed or no ignition of fuel.

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